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利用原子力显微镜测定了聚苯乙烯(Polystyrene,PS)微球和核壳结构PS/CeO2复合微球的力-位移曲线,并根据Hertz接触理论计算了微球样品的弹性模量.结果表明:粒径在120 nm左右的PS微球的平均弹性模量约为2.80 GPa,其数值略低于聚苯乙烯块体材料的弹性模量.复合微球的弹性模量随CeO2壳层厚度的增加而增大,当CeO2壳厚分别约为8、12和16 nm时,其平均弹性模量依次约为7.93、8.25和10.67 GPa.与纯氧化铈相比,PS/CeO2复合微球的弹性模量更接近于聚苯乙烯微球.
The force-displacement curves of polystyrene (PS) microspheres and core-shell PS / CeO2 microspheres were measured by atomic force microscopy and the elastic modulus of microspheres was calculated according to Hertz contact theory.The results showed that The average elastic modulus of PS microspheres with a diameter of about 120 nm is about 2.80 GPa, which is slightly lower than that of the polystyrene bulk material. The elastic modulus of PS microspheres increases with the increase of the shell thickness of CeO2 When the CeO2 shell thickness is about 8, 12 and 16 nm respectively, the average elastic modulus is about 7.93, 8.25 and 10.67 GPa, respectively.Compared with pure cerium oxide, the elastic modulus of PS / CeO2 composite microspheres More close to the polystyrene microspheres.